From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6D534C4332F for ; Fri, 9 Dec 2022 09:19:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229988AbiLIJTq (ORCPT ); Fri, 9 Dec 2022 04:19:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229807AbiLIJTn (ORCPT ); Fri, 9 Dec 2022 04:19:43 -0500 Received: from mail-io1-f70.google.com (mail-io1-f70.google.com [209.85.166.70]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0C91562E97 for ; Fri, 9 Dec 2022 01:19:42 -0800 (PST) Received: by mail-io1-f70.google.com with SMTP id l22-20020a05660227d600b006dfa191ca8aso1807927ios.20 for ; Fri, 09 Dec 2022 01:19:42 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=seze8zafSimQFws6rjLDlyArlrppdJnhF3uf7L6dJwk=; b=yBgR5H2YAvDtdlPBZBxHo6X6XjhiZ3bq9czKoqMyvizR0103tBInWScyu4gQkuxh7J h0h0RFy+RJVWAz0uJxyj7Lh4zN+bW6nqtdlsz4iJNMvl0mn+LTIVVBbf3LKc1KHvialf qM7Xh6M2ZhzvFXVkk9iGXnU8a/qzd/yaH4KjH3jOygJpsmIMgnQlUMnhP7VMpFHsG1bB O5z5vyer1tqstCpuWbdtJuSAIVi+9ZCBhKDnHt4DDF3FW/1L2xJXlHBGVmsWR8fnnc2e 0sv9ADR3v3VNI+Aenj9Kxrv+Ukc+Uw1La5z3cWwW7sRKpCqdhtSDC4ekQ/dUsegNFvy/ BJog== X-Gm-Message-State: ANoB5pkj1ylQdws9/tj0TOA3aTfT8hGehRfop2SBg8aWuUofa5+BuVzO f+v6fy0Y/asH9L3V4e4UNyc1HrpTxmI207msWsvSnXCEv77m X-Google-Smtp-Source: AA0mqf4/RoUJzMxY7mVXgahQtv4ZtxKoB0Lt9q2yZ+oQ7vVNICa1Lc6ZF3HdZOd8bXbihlasiKbZwHwCNudzbe6K1cJ7IzhkU8fA MIME-Version: 1.0 X-Received: by 2002:a92:cccd:0:b0:302:58d0:2510 with SMTP id u13-20020a92cccd000000b0030258d02510mr37704310ilq.27.1670577581429; Fri, 09 Dec 2022 01:19:41 -0800 (PST) Date: Fri, 09 Dec 2022 01:19:41 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004f995905ef61a764@google.com> Subject: [syzbot] KMSAN: uninit-value in longest_match From: syzbot To: clm@fb.com, dsterba@suse.com, glider@google.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 30d2727189c5 kmsan: fix memcpy tests git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=117d38f5880000 kernel config: https://syzkaller.appspot.com/x/.config?x=a2144983ada8b4f3 dashboard link: https://syzkaller.appspot.com/bug?extid=14d9e7602ebdf7ec0a60 compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1e8c2d419c2e/disk-30d27271.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9e8a728a72a9/vmlinux-30d27271.xz kernel image: https://storage.googleapis.com/syzbot-assets/89f71c80c707/bzImage-30d27271.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+14d9e7602ebdf7ec0a60@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in longest_match+0xc88/0x1220 lib/zlib_deflate/deflate.c:668 longest_match+0xc88/0x1220 lib/zlib_deflate/deflate.c:668 deflate_fast+0x1838/0x2280 lib/zlib_deflate/deflate.c:954 zlib_deflate+0x1783/0x22b0 lib/zlib_deflate/deflate.c:410 zlib_compress_pages+0xd34/0x1f90 fs/btrfs/zlib.c:178 compression_compress_pages fs/btrfs/compression.c:77 [inline] btrfs_compress_pages+0x325/0x440 fs/btrfs/compression.c:1208 compress_file_range+0x11ac/0x3510 fs/btrfs/inode.c:730 async_cow_start+0x33/0xd0 fs/btrfs/inode.c:1458 btrfs_work_helper+0x55a/0x990 fs/btrfs/async-thread.c:280 process_one_work+0xb27/0x13e0 kernel/workqueue.c:2289 worker_thread+0x1076/0x1d60 kernel/workqueue.c:2436 kthread+0x31b/0x430 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Uninit was created at: __kmalloc_large_node+0x2f7/0x3a0 mm/slab_common.c:1106 __do_kmalloc_node mm/slab_common.c:943 [inline] __kmalloc_node+0x1d2/0x3c0 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0xbc/0x2d0 mm/util.c:581 kvmalloc include/linux/slab.h:706 [inline] zlib_alloc_workspace+0x111/0x5e0 fs/btrfs/zlib.c:66 alloc_workspace+0x329/0x5a0 fs/btrfs/compression.c:939 btrfs_init_workspace_manager+0x11f/0x4d0 fs/btrfs/compression.c:982 btrfs_init_compress+0x1f/0x30 fs/btrfs/compression.c:1249 init_btrfs_fs+0x94/0x5f2 fs/btrfs/super.c:2736 do_one_initcall+0x221/0x860 init/main.c:1303 do_initcall_level+0x146/0x322 init/main.c:1376 do_initcalls+0x11a/0x201 init/main.c:1392 do_basic_setup+0x22/0x24 init/main.c:1411 kernel_init_freeable+0x308/0x4d0 init/main.c:1631 kernel_init+0x2b/0x7d0 init/main.c:1519 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 CPU: 0 PID: 3530 Comm: kworker/u4:7 Not tainted 6.1.0-rc8-syzkaller-64144-g30d2727189c5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: btrfs-delalloc btrfs_work_helper ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.